The Biml Book by unknow

Author:unknow
Language: eng
Format: epub
Publisher: Apress, Berkeley, CA

Synthetic Metadata

Once metadata collection requirements grow large enough—usually in the neighborhood of five or more metadata attributes per entity type (table, column, index, etc.)—the hybrid approach becomes cumbersome and difficult to maintain. At that point, it is usually helpful to shift away from the hybrid approach and move to a synthetic metadata store.

The core reason for this is similar to why relational structures in an RDBMS are often more powerful and descriptive than key/value stores such as Hadoop with equivalent amounts of modeling effort. When using a hybrid approach, the metadata attributes must be key/value pairs attached to existing items. This then limits the types of relationships that metadata attributes can have with each other. Of course, you can hack in support for more complex relationships, but it normally involves a combination of the following: 1.Values that represent encoded or serialized representations of complex objects.

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